7. Silber S., Nagy Z., Devroey P. et al. Distribution of spermatogenesis in the testicles of azoospermic men: the presence or abscence of spermatids in the testes of men with germinal failure. Hum Reprod 1997;12(11):2422–8.

81. Karacan M., Alwaeely F., Erkan S. et al. Outcome of intracytoplasmic sperm injection cycles with fresh testicular spermatozoa obtained on the day of or the day before oocyte collection and with cryopreserved testicular sperm in patients with azoospermia. Fertil Steril 2013;100(4):975–80.